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Hiding corys

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Hi all,

I have a 125l tank and have 6 spotted corys.

there seems to be 3 bigger ones that are visible in the tank, yet there are three slightly smaller ones that hide constantly underneath one of the ornaments in the tank. (its ruin with a hollowed out bottom)

i have been told not to worry, but i never see them unless i move the ornament.

Is there anything i should worry about? or is it just that they arew smaller?

BTW, have my water tested once a month, no ammonia, or nitrites and very low nitrates, so dont think its water quality, and i have deliberately gotten 6 plus 3 smaller black corys so that there is a decent number to avoid bullying.

Do you know specifically what species they are? You've done the right thing to get 6, but only having 3 black ones - they'll want a bigger school too.

I have two schools of cories (peppered and sterbai) in my 120 litre and whilst they mix readily, they do prefer their own species' company. The sterbais I have are very shy and hide a lot which is normal for them. The peppereds are very relaxed and brave.

I wouldn't worry about yours, it may just be their species type. I would get yourself a liquid test kit though and test every week or two (or just before a water change).